Tanya obtained 95% marks in Physics, Chemistry and Maths together and she obtained 225 marks in Social Science, English and Hindi together. If the maximum marks of each subject is 100, what is Tanya's overall percentage in all the six subjects together ?

Using option 1 : 666 + 10 = 676 = (26) Hence it is a perfect square The number does not yield a perfect square With any other option Hence. 10 is the minimum number that should be added to 666 to make it a perfect square

In a class, the number of boys and the number of girls are in the ratio of 4 : 5. If 10 more boys join, the ratio of the number of boys to the number of girls becomes 6 : 5 . How many girls are there in the class ?